Yaws (A66) ICD-10-CM
The A66 code range covers yaws with 11 ICD-10-CM diagnosis codes. 10 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- bouba
- frambesia (tropica)
- pian
Codes in the A66 Range 11 codes · 10 billable
- A66 YawsNon-billable
- A66.0 Initial lesions of yaws
- A66.1 Multiple papillomata and wet crab yaws
- A66.2 Other early skin lesions of yaws
- A66.3 Hyperkeratosis of yaws
- A66.4 Gummata and ulcers of yaws
- A66.5 Gangosa
- A66.6 Bone and joint lesions of yaws
- A66.7 Other manifestations of yaws
- A66.8 Latent yaws
- A66.9 Yaws, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the A66 range.
Treponema pallidum
The causative agent of venereal and non-venereal syphilis as well as yaws.
Yaws
A systemic non-venereal infection of the tropics caused by TREPONEMA PALLIDUM subspecies pertenue.
About the A66 Code Range
ICD-10 code A66 and its subcodes are used to identify and classify various stages and manifestations of Yaws, a chronic infectious disease affecting the skin, bones, and joints.
These codes cover conditions from the initial skin lesions, such as the initial frambesial ulcer (A66.0), to multiple papillomata known as wet crab yaws (A66.1). The classification also includes early skin changes like maculopapular eruptions (A66.2), thickened skin or hyperkeratosis characteristic of yaws (A66.3), and more severe symptoms such as gummata and ulcers (A66.4), gangosa (chronic nasopharyngitis, A66.5), and bone or joint involvement, including arthritis and periostitis (A66.6). Other manifestations like juxta-articular nodules and latent yaws are captured under A66.7 and A66.8 respectively, while unspecified cases fall under A66.9. This detailed coding system helps medical coders accurately document yaws conditions, including synonyms like "frambesial ulcer," "butter yaws," or "gummatous osteitis," ensuring clarity in diagnosis and treatment records.
Questions About This Page
How many billable codes are in the A66 range?
Of the 11 codes in this range, 10 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the A66 range classify?
The range classifies yaws. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
